Add unit tests for exceptions in GCP gen. ai operators

[shahar1]

Body

Currently the GCP gen. ai operators (providers/google/src/airflow/providers/google/cloud/operators/gen_ai.py) are lacking unit tests for exceptions - it would be great if someone could add some.

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[KL-2300032590]

I’d like to take this up and start by adding unit tests for one or two GenAI operatores.

[shahar1]

I’d like to take this up and start by adding unit tests for one or two GenAI operatores.

Thank you! Please be sure not to collide with current efforts in #61253 (avoid implementing for GenAIGeminiCreateBatchJobOperator)

[KL-2300032590]

I added unit tests for validation in GenAIGenerateContentOperator
(missing project_id / location), avoiding GenAIGeminiCreateBatchJobOperator as requested.
PR: #61262.

[rutiktambe]

The validation-focused unit tests for GenAIGenerateContentOperator make sense as a starting point, and it’s good to see #61253 being avoided as requested. I’ll take a look at PR #61262.

If more coverage is needed later (e.g. execution paths or error handling for other GenAI operators), I’d be happy to help with reviews or additional tests.